Alkyl-substituted carbamates



Patented Jan. 2, 1951 Domenick Papa lBrooklyn, and Nathan Sperber,

Bronx NwY and Erwin S'chwenk, Montclair, N. J 2, assignors to ScheringCorporation, Bloomfield, N. J., atcorporationo1fNewJersey No Drawing; ApplicationiJuly 23",1946,

Serial No. 685,776

6 Claims; ((31. 260-482 This lnventionwrelates to ainew group of subi stances which have been found to possessstrong spasmolytic activity. It is aniobject ofL tha invention to prepare anti-spasmodics whichpos- 2 t in place of tributylmethyl isocyanate other similarly substituted, isocy anates may be used, such as ethyldibutylmethylisocyanate, triamylsess not only powerful neurotropic activity but 5 Other basically substitutedalkanols maybe used also strong musculotropic action. l inlplace oflthe p-diethylaminoethanol. For ex- It has been recognized by the medical prolample, '4-ethanol- \piperidihe, fi-dibuty'laininofession that anti-spasmodics which are effective ethanol, 'c-dimethylaminoethanol; 'y-diethylboth against spasms of nervous origin and aminopropanol, are useful intermediates. against those of muscular origin are of consid- The following example is illustrative of the erable therapeutic value. Such substances are methods by which the compounds of the invenparticularly useful in those cases where the type tion may be prepared: 0 of spasm cannot be readily classified. I

The new substances of the invention comprise .flll yl ester 9f trlbuiylmethyl the general formula carbamic acid Equimolecular proportions of tributylmethyl' R?C-NH.COO.R5-N=R4 isocyanate and B-diethylaminoethanol are heated under reflux, preferably in a solvent such as xylene for approximately -30 hours. After wherem R2 and R3 represent lower auFyl 20 stripping ofi the xylene in vacuo, the resulting groups; g alksg grogps z g i carbamate is fractionally distilled in vacuum. It t 5 5 1 t i; an g has been found advantageous to distill the cari mm car on 10 bamate as quickly as possible since slow distil- Sen 5 W0 ower y ggoups con ammg. mm lation tends to regenerate the two starting mato 5 carbon atoms or a bivalent alkyl chain, such terials The pure ethylaminethyl tributyb as (CH2)5 t? B5 is bivalent alkyl chain methyl carbamate boils at 175-1'76/3 mm. preferably containing not more than three car- For ease of administration as Well as in gg 'ihe i g i this i g pounding the substances of the invention are g a o 3 5 0 neuro ropm an preferably used in the form of their salts, such cu 0 0pm ac 1V as the hydrochlorides, the methiodides and the The compounds of this invention may be prelike pared by lieacting a tri'supstituteq methyl q' The following table sets forth a number of zygillatelkwitl'il t Fe DD P g typical spasmolytic substances of the invention, u e ano or examp y con.ensmg m all of which may be prepared by the method deany of .several W tnbutylmetpyl lsqcyanace scribed in the foregoing example by the reaction and.fl'dlethylammoethainol' there IS Obtamed the of the isocyanates and aminoalkanols indicated '3"d1ethy1a.mmethy1 .tnbutylmethyl carbamtte' in the table. The table also gives the boiling Fgifgff may be Illustrated by the followmg points of the substances in degrees centigrade q and their spasmolytic activities expressed on the (C4H9)3C-N=C=O+HOCH2CH2N(C2H5)2- basis of papaverine activity equal to and (CHQ)3CNHCOOCH2CH2N(C2H5)2 atropine activity equal to 100%.

Spasmolytic Activity No. Isocyimate Aminoalkanol B. P

Papaverine Atropine Percent Percent 1 Triethylmethyl B-diethylaminoethanol .l l28129,lmm 01 2 EthyldibutylmethyL. l d 2 200 0.4 a- Tributylmethyl "do 600-850 2. 5-4 4 d fl-dimethylaminoethanol 500-700 1 B-dibutylaminoethanol. 500-700 1 B-diethy1aminopropanol 600-700 1. 8 'y-diethy1aminopropauo1.. 600 1.8 B-piperidinoethanol 500 0.6-1 .--ld0 -dibutylaminopropano1 400 0.5 10"... Ttiamylmethyl B-dlethylaminoethanol 180-18331111111 200-300 0.5

3 We claim: 1. Substituted carbamates of the general formula Ra-C-NH-C 0414-115 and the salts thereof, wherein R1, R2, and R3 represent lower alkyl groups containing together from 10 to 15 carbon atoms, R4 is a bivalent alkylene chain containing not more than 3 carbon atoms,'and R5 is selected from the group consisting of dialkylamino in which the alkyl groups contain from 1 to 4 carbon atoms and piperidino, and having both neurotropic and musculotropic spasmolytic activity.

2. The dialkylaminoethyl esters of tributylmethyl carbamic acid, wherein the said alkyls each contain from 1 to 4 carbon atoms, and the salts thereof.

3. The dialkylaminopropyl esters of tributylmethyl carbamic acid, wherein the said alkyls each contain from 1 to 4 carbon atoms, and the salts thereof.

4. The ,B-diethylaminoethyl ester of tributylmethyl carbamic acid and salts thereof.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,408,893 Swan et al Oct. 8, 1946 FOREIGN PATENTS Number Countrv Date 370,693 Great Britain Apr. 14, 1932 OTHER REFERENCES Donleavy et al.: "Jour. Am. Chem. 800., vol. 62 (1940), pp. 218-219.

Manual of Pharmacology--Sollman, 6th ed., page 299 (1942). 2Bssndlerz Chem. Abstracts, vol. 37 (1943), p. 

1. SUBSTITUTED CARBAMATES OF THE GENERAL FORMULA 